Uh, you forgot to input your public IP...
You should set the IP for the interface that you're getting your internet connection from (your "public" interface) to the IP address given by your ISP. Also, have you done the NAT masquerading?
IMHO, the easiest way would be to connect to the webbox and set the defaults from there. You can then tweak the firewall, add more NAT, etc from the winbox after you can connect to the internet.
Here's how:
Open your browser, go to your router's IP (I assume it would be 192.168.1.1). Enter user ID and password, then after you got in, go to the "Firewall" section. Or if your webbox is showing an auto config kinda page, click "Advanced" first.
In the firewall section, select the correct interface for your public connection, then click all three checkboxes underneath it. Click apply. All done.
Also, your main gateway is NOT your router's IP.
It's the gateway for your public IP, and these numbers should be given to you by your ISP. The first 3 numbers of these IPs should be the same, only the last number is different. It should be something similar to this: IP is aaa.bbb.ccc.254, and gateway is aaa.bbb.ccc.253.
Hope this helps.
If anyone think I'm doing something wrong, feel free to correct me.
-T-